Source code for scrapy.downloadermiddlewares.httpproxy

import base64
from urllib.parse import unquote, urlunparse
from urllib.request import _parse_proxy, getproxies, proxy_bypass

from scrapy.exceptions import NotConfigured
from scrapy.utils.httpobj import urlparse_cached
from scrapy.utils.python import to_bytes

[docs]class HttpProxyMiddleware: def __init__(self, auth_encoding="latin-1"): self.auth_encoding = auth_encoding self.proxies = {} for type_, url in getproxies().items(): try: self.proxies[type_] = self._get_proxy(url, type_) # some values such as '/var/run/docker.sock' can't be parsed # by _parse_proxy and as such should be skipped except ValueError: continue @classmethod def from_crawler(cls, crawler): if not crawler.settings.getbool("HTTPPROXY_ENABLED"): raise NotConfigured auth_encoding = crawler.settings.get("HTTPPROXY_AUTH_ENCODING") return cls(auth_encoding) def _basic_auth_header(self, username, password): user_pass = to_bytes( f"{unquote(username)}:{unquote(password)}", encoding=self.auth_encoding ) return base64.b64encode(user_pass) def _get_proxy(self, url, orig_type): proxy_type, user, password, hostport = _parse_proxy(url) proxy_url = urlunparse((proxy_type or orig_type, hostport, "", "", "", "")) if user: creds = self._basic_auth_header(user, password) else: creds = None return creds, proxy_url def process_request(self, request, spider): creds, proxy_url, scheme = None, None, None if "proxy" in request.meta: if request.meta["proxy"] is not None: creds, proxy_url = self._get_proxy(request.meta["proxy"], "") elif self.proxies: parsed = urlparse_cached(request) _scheme = parsed.scheme if ( # 'no_proxy' is only supported by http schemes _scheme not in ("http", "https") or not proxy_bypass(parsed.hostname) ) and _scheme in self.proxies: scheme = _scheme creds, proxy_url = self.proxies[scheme] self._set_proxy_and_creds(request, proxy_url, creds, scheme) def _set_proxy_and_creds(self, request, proxy_url, creds, scheme): if scheme: request.meta["_scheme_proxy"] = True if proxy_url: request.meta["proxy"] = proxy_url elif request.meta.get("proxy") is not None: request.meta["proxy"] = None if creds: request.headers[b"Proxy-Authorization"] = b"Basic " + creds request.meta["_auth_proxy"] = proxy_url elif "_auth_proxy" in request.meta: if proxy_url != request.meta["_auth_proxy"]: if b"Proxy-Authorization" in request.headers: del request.headers[b"Proxy-Authorization"] del request.meta["_auth_proxy"] elif b"Proxy-Authorization" in request.headers: if proxy_url: request.meta["_auth_proxy"] = proxy_url else: del request.headers[b"Proxy-Authorization"]